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-rw-r--r--kernel/fs/ocfs2/suballoc.h237
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diff --git a/kernel/fs/ocfs2/suballoc.h b/kernel/fs/ocfs2/suballoc.h
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+++ b/kernel/fs/ocfs2/suballoc.h
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+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * suballoc.h
+ *
+ * Defines sub allocator api
+ *
+ * Copyright (C) 2003, 2004 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef _CHAINALLOC_H_
+#define _CHAINALLOC_H_
+
+struct ocfs2_suballoc_result;
+typedef int (group_search_t)(struct inode *,
+ struct buffer_head *,
+ u32, /* bits_wanted */
+ u32, /* min_bits */
+ u64, /* max_block */
+ struct ocfs2_suballoc_result *);
+ /* found bits */
+
+struct ocfs2_alloc_context {
+ struct inode *ac_inode; /* which bitmap are we allocating from? */
+ struct buffer_head *ac_bh; /* file entry bh */
+ u32 ac_alloc_slot; /* which slot are we allocating from? */
+ u32 ac_bits_wanted;
+ u32 ac_bits_given;
+#define OCFS2_AC_USE_LOCAL 1
+#define OCFS2_AC_USE_MAIN 2
+#define OCFS2_AC_USE_INODE 3
+#define OCFS2_AC_USE_META 4
+ u32 ac_which;
+
+ /* these are used by the chain search */
+ u16 ac_chain;
+ int ac_disable_chain_relink;
+ group_search_t *ac_group_search;
+
+ u64 ac_last_group;
+ u64 ac_max_block; /* Highest block number to allocate. 0 is
+ is the same as ~0 - unlimited */
+
+ int ac_find_loc_only; /* hack for reflink operation ordering */
+ struct ocfs2_suballoc_result *ac_find_loc_priv; /* */
+
+ struct ocfs2_alloc_reservation *ac_resv;
+};
+
+void ocfs2_init_steal_slots(struct ocfs2_super *osb);
+void ocfs2_free_alloc_context(struct ocfs2_alloc_context *ac);
+static inline int ocfs2_alloc_context_bits_left(struct ocfs2_alloc_context *ac)
+{
+ return ac->ac_bits_wanted - ac->ac_bits_given;
+}
+
+/*
+ * Please note that the caller must make sure that root_el is the root
+ * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
+ * the result may be wrong.
+ */
+int ocfs2_reserve_new_metadata(struct ocfs2_super *osb,
+ struct ocfs2_extent_list *root_el,
+ struct ocfs2_alloc_context **ac);
+int ocfs2_reserve_new_metadata_blocks(struct ocfs2_super *osb,
+ int blocks,
+ struct ocfs2_alloc_context **ac);
+int ocfs2_reserve_new_inode(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context **ac);
+int ocfs2_reserve_clusters(struct ocfs2_super *osb,
+ u32 bits_wanted,
+ struct ocfs2_alloc_context **ac);
+
+int ocfs2_alloc_dinode_update_counts(struct inode *inode,
+ handle_t *handle,
+ struct buffer_head *di_bh,
+ u32 num_bits,
+ u16 chain);
+void ocfs2_rollback_alloc_dinode_counts(struct inode *inode,
+ struct buffer_head *di_bh,
+ u32 num_bits,
+ u16 chain);
+int ocfs2_block_group_set_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct ocfs2_group_desc *bg,
+ struct buffer_head *group_bh,
+ unsigned int bit_off,
+ unsigned int num_bits);
+
+int ocfs2_claim_metadata(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 bits_wanted,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit_start,
+ u32 *num_bits,
+ u64 *blkno_start);
+int ocfs2_claim_new_inode(handle_t *handle,
+ struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *ac,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit,
+ u64 *fe_blkno);
+int ocfs2_claim_clusters(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 min_clusters,
+ u32 *cluster_start,
+ u32 *num_clusters);
+/*
+ * Use this variant of ocfs2_claim_clusters to specify a maxiumum
+ * number of clusters smaller than the allocation reserved.
+ */
+int __ocfs2_claim_clusters(handle_t *handle,
+ struct ocfs2_alloc_context *ac,
+ u32 min_clusters,
+ u32 max_clusters,
+ u32 *cluster_start,
+ u32 *num_clusters);
+
+int ocfs2_free_suballoc_bits(handle_t *handle,
+ struct inode *alloc_inode,
+ struct buffer_head *alloc_bh,
+ unsigned int start_bit,
+ u64 bg_blkno,
+ unsigned int count);
+int ocfs2_free_dinode(handle_t *handle,
+ struct inode *inode_alloc_inode,
+ struct buffer_head *inode_alloc_bh,
+ struct ocfs2_dinode *di);
+int ocfs2_free_clusters(handle_t *handle,
+ struct inode *bitmap_inode,
+ struct buffer_head *bitmap_bh,
+ u64 start_blk,
+ unsigned int num_clusters);
+int ocfs2_release_clusters(handle_t *handle,
+ struct inode *bitmap_inode,
+ struct buffer_head *bitmap_bh,
+ u64 start_blk,
+ unsigned int num_clusters);
+
+static inline u64 ocfs2_which_suballoc_group(u64 block, unsigned int bit)
+{
+ u64 group = block - (u64) bit;
+
+ return group;
+}
+
+static inline u32 ocfs2_cluster_from_desc(struct ocfs2_super *osb,
+ u64 bg_blkno)
+{
+ /* This should work for all block group descriptors as only
+ * the 1st group descriptor of the cluster bitmap is
+ * different. */
+
+ if (bg_blkno == osb->first_cluster_group_blkno)
+ return 0;
+
+ /* the rest of the block groups are located at the beginning
+ * of their 1st cluster, so a direct translation just
+ * works. */
+ return ocfs2_blocks_to_clusters(osb->sb, bg_blkno);
+}
+
+static inline int ocfs2_is_cluster_bitmap(struct inode *inode)
+{
+ struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+ return osb->bitmap_blkno == OCFS2_I(inode)->ip_blkno;
+}
+
+/* This is for local alloc ONLY. Others should use the task-specific
+ * apis above. */
+int ocfs2_reserve_cluster_bitmap_bits(struct ocfs2_super *osb,
+ struct ocfs2_alloc_context *ac);
+void ocfs2_free_ac_resource(struct ocfs2_alloc_context *ac);
+
+/* given a cluster offset, calculate which block group it belongs to
+ * and return that block offset. */
+u64 ocfs2_which_cluster_group(struct inode *inode, u32 cluster);
+
+/*
+ * By default, ocfs2_read_group_descriptor() calls ocfs2_error() when it
+ * finds a problem. A caller that wants to check a group descriptor
+ * without going readonly should read the block with ocfs2_read_block[s]()
+ * and then checking it with this function. This is only resize, really.
+ * Everyone else should be using ocfs2_read_group_descriptor().
+ */
+int ocfs2_check_group_descriptor(struct super_block *sb,
+ struct ocfs2_dinode *di,
+ struct buffer_head *bh);
+/*
+ * Read a group descriptor block into *bh. If *bh is NULL, a bh will be
+ * allocated. This is a cached read. The descriptor will be validated with
+ * ocfs2_validate_group_descriptor().
+ */
+int ocfs2_read_group_descriptor(struct inode *inode, struct ocfs2_dinode *di,
+ u64 gd_blkno, struct buffer_head **bh);
+
+int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_extent_tree *et,
+ u32 clusters_to_add, u32 extents_to_split,
+ struct ocfs2_alloc_context **data_ac,
+ struct ocfs2_alloc_context **meta_ac);
+
+int ocfs2_test_inode_bit(struct ocfs2_super *osb, u64 blkno, int *res);
+
+
+
+/*
+ * The following two interfaces are for ocfs2_create_inode_in_orphan().
+ */
+int ocfs2_find_new_inode_loc(struct inode *dir,
+ struct buffer_head *parent_fe_bh,
+ struct ocfs2_alloc_context *ac,
+ u64 *fe_blkno);
+
+int ocfs2_claim_new_inode_at_loc(handle_t *handle,
+ struct inode *dir,
+ struct ocfs2_alloc_context *ac,
+ u64 *suballoc_loc,
+ u16 *suballoc_bit,
+ u64 di_blkno);
+
+#endif /* _CHAINALLOC_H_ */